In Reply.—Jones et al reaffirm South Carolina's ongoing commitment to AIDS surveillance, and we anticipate that the completeness of reporting will improve with this new program.The results from the two Michigan hospitals reported by Mss Mokotoff and Galbraith are consistent with those found by Chamberland et al,1 Lafferty et al,2 and others, as well as in our own subset of large hospitals that provide care to many patients with AIDS. An important distinction between the South Carolina and Michigan studies is that the latter was not statewide and thus excludes smaller and rural hospitals in Michigan, which may have lower reporting levels.We considered the possible effect of the 1987 change in surveillance criteria on our findings. However, we observed that reporting levels were not substantially different, 50% and 57%, respectively, for persons meeting earlier vs the extended (1987) surveillance definitions. Thus, we concluded that the